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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

1) The maximum number of electrons that can be accommodated in ‘f’ sub shell is ⍟⍟⍟

A) 32

B) 14

C) 8

D) 2

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

2) Cathode rays are ⍟⍟⍟

A) α-particles

B) Protons

C) Electrons

D) Neutrons

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

3) Bohr’s radius can have ⍟⍟⍟

A) +ve values

B) -ve values

C) Discrete values

D) Fractional values

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

4) The charge on the electron and proton is reduced to half. If the present value of Rydberg constant is R, then the new value of Rydberg constant will be: ETEA 2008

A) R/8

B) R/2

C) R/16

D) R/4

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> SPECTRUM

5) Which of the following spectral lines series lies in the visible region? ETEA – 2023

A) Pfund series

B) Balmer series

C) Lyman series

D) Bracket series

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

6) The splitting of spectral lines in magnetic field is (KP-MDCAT 2024)

A) Aufbau principle

B) Zeeman effect

C) Pauli exclusion principle

D) Stark effect

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

7) Which of the following statements does not form part of Bohr’s model of the hydrogen atom ⍟⍟⍟

A) Electrons revolve in different orbits around the nucleus

B) Energy of the electrons in the orbit is quantized

C) The electron in the orbit nearest the nucleus has the lowest energy

D) The position and velocity of the electrons in the orbit cannot be determined simultaneously

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

8) When an electron jumps from L to K shell ⍟⍟⍟

A) Energy is sometimes absorbed and sometimes released

B) Energy is neither absorbed nor released

C) Energy is released

D) Energy is absorbed

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

9) Which of the following elements with the given electronic configuration has the highest ionization energy? (ETEA 2011)

A) 1S² 2S² 2P⁶ 3S¹

B) 1S² 2S² 2P⁴

C) 1S² 2S² 2P³

D) 1S² 2S² 2P⁶ 3S² 3P³

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

10) Positive ions are formed from the neutral atom by the ⍟⍟⍟

A) Loss of electrons

B) Gain of protons

C) Loss of protons

D) Increase of nuclear charge

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

11) When beryllium is bombarded with α-particles, extremely penetrating radiations which cannot be deflected by electrical or magnetic field is given out. These are ⍟⍟⍟

A) A beam of protons

B) A beam of neutrons

C) X-rays

D) α-rays

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

12) Px orbital can accommodate ⍟⍟⍟

A) 2 electrons with parallel spins

B) 2 electrons with opposite spins

C) 4 electrons

D) 6 electrons

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

13) Choose the value of the Rydberg constant among the following value? NUMS 2014

A) 1.09678 x 10⁷ m⁻¹

B) 1.602 x 10⁻¹⁹ C

C) 1.7588 x 10¹¹

D) 1.007 x 10⁷ m⁻¹

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

14) Electron, proton and neutron What is the other name of positive rays? ETEA – 2023

A) Quantum

B) Magnetic rays

C) Photon rays

D) Canal rays

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

15) The number of orbitals in the fourth principal quantum number will be ⍟⍟⍟

A) 8

B) 12

C) 4

D) 16

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

16) The correct sequence of electronic configuration is: (ETEA – 2023)

A) 4p 4s 4d 5p 5s 4f5d

B) 4p 4s 4d 5p 5s 5f6d

C) 4p 3s 4d 5p 6s 4f5d

D) 4p 5s 4d 5p 6s 4f5d

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

17) 2p orbitals have ⍟⍟⍟

A) n=2, l=1

B) n=1, l=2

C) n=2, l=0

D) n=1, l=0

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

18) Quantum number values for “2p’ orbitals are: ETEA – 2020

A) n=1, 1=2

B) n=2, 1=0

C) n=1, I=0

D) n=2, 1=1

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> x-rays

19) If an atom exists in the excited state n = 5, the maximum number of transition takes place is: ETEA – 2011

A) 5

B) 6

C) 3

D) 10

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

20) Electronic configuration of Gold [Au79] is (MDCAT 2015)

A) [Xe] 4f¹⁴, 5d¹⁰, 6s²

B) [Xe] 4f¹⁴, 5d¹⁰, 6s¹

C) [Xe] 4f¹⁴, 5d⁹, 6s²

D) [Xe] 4f¹⁰, 5d¹⁰, 6s²

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

21) If value of azimuthal quantum number l is 2, then total possible values of magnetic quantum number will be ⍟⍟⍟

A) 2

B) 3

C) 5

D) 7

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

22) The two electrons in K sub-shell will differ in ⍟⍟⍟

A) Spin quantum number

B) Azimuthal quantum number

C) Magnetic quantum number

D) Principal quantum number

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

23) There are four orbitals s, p, d and f. Which order is correct with respect to the increasing energy of the orbitals? (MDCAT 2015)

A) 4s < 4p < 4d < 4f

B) 4f < 4s < 4d < 4p

C) 4s < 4f < 4p < 4d

D) 4p < 4s < 4f < 4d

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

24) “Two electrons in the same orbit must have opposite spins” according to orbital should have (KMU-CAT 2024)

A) None of these

B) Pauli’s exclusion rule

C) Aufbau’s principle

D) Hund’s rule

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

25) The constancy of e/m ratio for electron shows that; ETEA 2006

A) Electrons are produced in discharge tube only

B) None of the above

C) Electrons are universal particles of all matter

D) Electron mass is 1/837th of proton

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

26) The number of orbital’s in ‘M’ shell of an atom is; ETEA 2010

A) 5

B) 9

C) 1

D) 4

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic number, Mass number, Atomic species

27) Which of the following are isoelectronic with one another? ⍟⍟⍟

A) K⁺ and O

B) Ne and O

C) Na⁺ and K⁺

D) Na⁺ and Ne

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

28) If n=3, then the value of ‘l’ which is incorrect is ⍟⍟⍟

A) 3

B) 1

C) 2

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

29) The possible number of Orbitals in an orbit having principal quantum number 4 is KMU-CAT 2024

A) 3

B) 14

C) 32

D) 16

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

30) The number of orbitals in 2p sub-shell is ⍟⍟⍟

A) 6

B) 2

C) 4

D) 3

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> x-rays

31) If the required excitation voltage is given, for which element the x-rays spectrum consists of three spectral lines i.e. Kα kβ lα ETEA 2018

A) boron

B) K

C) Na

D) Ca

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

32) The correct electronic configuration of Nickel (28) is: (ETEA 2012)

A) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s¹ 4p³

B) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²

C) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s² 4p²

D) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s² 4p¹

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

33) When the azimuthal quantum number has a value of l = 0, the shape of the orbital is ⍟⍟⍟

A) Spherical

B) Unsymmetrical

C) Rectangular

D) Dumbbell

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> SPECTRUM

34) Photon of which of the following series will have largest wave length ETEA – 2022

A) Pfund series

B) Balmer series

C) Paschen series

D) Bracket series

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

35) Quantum number which describes the orientation of orbitals in three dimensional space is ETEA – 2019

A) azimuthal quantum number

B) principal quantum number

C) spin quantum number

D) magnetic quantum number

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

36) The relationship between quantum number n and I is: ETEA – 2020

A) I = n-2

B) n = 1-1

C) n= 1-2

D) I = n-1

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> x-rays

37) X-rays are widely used as a diagnostic tool in Medicine because of its: ETEA 2016

A) High penetrating power

B) Particle property

C) Cost of X-ray unit is low

D) It is not electromagnetic waves

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

38) The maximum number of electrons that can be accommodated in the Mth shell is ⍟⍟⍟

A) 32

B) 18

C) 8

D) 2

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

39) Bohr model of an atom could not account for ⍟⍟⍟

A) Absorption spectrum

B) Fine spectrum

C) Line spectrum of hydrogen

D) Emission spectrum

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

40) In the discharge tube emission the cathode rays requires: ETEA 2008

A) High potential and high pressure

B) High potential and low pressure

C) Low potential and high pressure

D) Low potential and low pressure

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

41) The energy of second Bohr orbit of the hydrogen atom is –328 kJ mol⁻¹, hence the energy of fourth Bohr orbit would be ⍟⍟⍟

A) –82 kJ mol⁻¹

B) –41 kJ mol⁻¹

C) –1312 kJ mol⁻¹

D) –164 kJ mol⁻¹

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

42) Which orbital is dumb-bell shaped? ⍟⍟⍟

A) p-orbital

B) f-orbital

C) d-orbital

D) s-orbital

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

43) The number of orientations of a sub-shell for which n=4 and 1=3 will be: ETEA – 2023

A) 1

B) 5

C) 3

D) 7

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

44) The quantum numbers for the outermost electron of an element are given as n=2, l=0, m=0, s=+½. The atom is ⍟⍟⍟

A) Boron

B) Lithium

C) Hydrogen

D) Beryllium

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

45) The total number of unpaired electrons in d-orbitals of atoms of element of atomic number 29 is ⍟⍟⍟

A) 5

B) 10

C) 1

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> SPECTRUM

46) Transition from n = 4,5,6…………….. to n = 3 in hydrogen spectrum gives ETEA 2007

A) Balmr series

B) Lyman series

C) Paschen series

D) Pfund series

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

47) Which set of quantum numbers are not possible from the following? ⍟⍟⍟

A) 3, 2, -2, -½

B) 3, 2, 0, -½

C) 3, 3, -3, -½

D) 3, 0, 0, -½

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

48) The charge on one kg of electron is NUMS 2020

A) 7.9 × 10²³C

B) 1.65 × 10¹⁹C

C) 1.7588 × 10¹¹C

D) 9.1095 × 10³¹C

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

49) Be’s 4th electron will have four quantum numbers ⍟⍟⍟

A) 2, 0, 0, -½

B) 1, 0, 0, ½

C) 2, 1, 0, +½

D) 1, 1, 1, ½

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

50) Which one of the following is not the characteristic of Planck’s quantum theory of radiation ⍟⍟⍟

A) The energy is not absorbed or emitted in whole number or multiple of quantum

B) Radiation energy is not emitted or absorbed continuously but in the form of small packets called quanta

C) This magnitude of energy associated with a quantum is proportional to the frequency

D) Radiation is associated with energy

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

51) When 3d orbital is complete, the new electron will enter the ⍟⍟⍟

A) 4p-orbital

B) 4s-orbital

C) 4d-orbital

D) 4f-orbital

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

52) The four quantum numbers for the valence shell electron or last electron of sodium (Z=11) is ⍟⍟⍟

A) 2, [missing], -1, -½

B) 3, 0, 0, ½

C) 3, 2, 2, ½

D) 3, 2, -2, -½

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic number, Mass number, Atomic species

53) Na⁺ ion is isoelectronic with: ⍟⍟⍟

A) Ba⁺²

B) Li⁺

C) Ca⁺²

D) Mg⁺²

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

54) Which electronic level will allow the hydrogen atom to absorb a photon but not emit? ⍟⍟⍟

A) 3d

B) 2S2p3d

C) 2p3d

D) 1S

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

55) The quantum number which specifies the location of an electron as well as energy is ⍟⍟⍟

A) Magnetic quantum number

B) Spin quantum number

C) Principal quantum number

D) Azimuthal quantum number

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

56) The total energy of a Hydrogen atom in its ground state is: ETEA 2012

A) negative

B) zero

C) None

D) positive

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> SPECTRUM

57) Which list shows electromagnetic waves in order of increasing frequency? ETEA 2018

A) Radio waves→infrared →ultraviolet →gamma rays

B) Ultraviolet→gamma rays→radio waves→ infrared

C) Radio waves →gamma rays→ ultraviolet → infra-red

D) Ultraviolet →infra-red→radio waves →gamma rays

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

58) The amount of energy associated with quantum of radiation is directly proportional to NUMS 2020

A) Photon

B) velocity

C) wavelength

D) frequency

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

59) The four quantum numbers of the outermost orbital of K (atomic no. =19) are ⍟⍟⍟

A) 3, 1, 1, +½

B) 4, 2, -1, +½

C) 2, 0, 0, +½

D) 4, 0, 0, +½

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

60) Electronic configuration of chromium (Proton number 24) is: (ETEA – 2020)

A) [Ar]3d⁴4s²

B) [Ar]3d⁵4s²

C) [Ar]3d⁵4s¹

D) [Ar]3d⁶4s²

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> SPECTRUM

61) Which of the following rays has the longest wavelength? ETEA 2012

A) Infrared rays

B) ultraviolet rays

C) x-rays

D) Gamma rays

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

62) For the dumb-bell shaped orbital, the value of l is ⍟⍟⍟

A) 3

B) 2

C) 1

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

63) The nature of anode rays depends upon ⍟⍟⍟

A) Nature of electrode

B) All the above

C) Nature of discharge tube

D) Nature of residual gas

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

64) The number of orbitals in d sub-shell is ⍟⍟⍟

A) 1

B) 3

C) 5

D) 7

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

65) In a given atom no two electrons can have the same values for all the four quantum numbers. This is called ⍟⍟⍟

A) Aufbau’s principle

B) Uncertainty principle

C) Hund’s rule

D) Pauli’s exclusion principle

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

66) Greater the wavelength associated with the photon ETEA – 2022

A) Greater is its energy

B) Smaller is its energy

C) Its energy will remain constant

D) Its energy will be variable

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

67) The atomic number of scandium is 21. What is its ground state electronic configuration? (ETEA 2012-2013)

A) 1s²2s²2p⁶3s²3p⁶3d¹4s²

B) 1s²2s²2p⁶3s²3p⁶3d³4p¹

C) 1s²2s²2p⁶3s²3p⁶3d³4s¹

D) 1s²2s²2p⁶3s²3p⁶3d³

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

68) The minimum real charge on any particle which can exist is ⍟⍟⍟

A) 1.6 × 10⁻¹⁹ Coulomb

B) 4.8 × 10⁻¹⁰ Coulomb

C) Zero

D) 1.6 × 10⁻¹⁰ Coulomb

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

69) The maximum number of electrons in electronic configuration can be calculated by using formula: (MDCAT 2016)

A) 2l + 1

B) 2n²

C) 2n² + 2

D) 2n² + 1

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

70) The electronic configuration of an element with atomic number 7 i.e. nitrogen atom is ⍟⍟⍟

A) 1s², 2s¹, 2Px³

B) 1s², 2s², 2Px¹,2Py²

C) 1s², 2s², 2Px¹,2Py¹,2Pz¹

D) 1s², 2s², 2Px²,2Py¹

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

71) Principal quantum number of an atom represents ⍟⍟⍟

A) Spin angular momentum

B) Orbital angular momentum

C) Space orientation of the orbital

D) Size of the orbital

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

72) Which one has one unpaired electron in the valence shell? (ETEA – 2023)

A) Zn²⁺

B) Cu⁺

C) Fe³⁺

D) Ti³⁺

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electron, proton and neutron

73) Ratio of masses of proton and electron is ⍟⍟⍟

A) 1.8

B) 1.8 × 10³

C) None of these

D) Infinite

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> SPECTRUM

74) Photon of the lowest wavelength is related to: ETEA – 2023

A) Bracket series

B) Paschen series

C) Pfund series

D) Balmer series

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

75) Electron occupies the available orbital singly before pairing in any one orbital occurs, it is ⍟⍟⍟

A) Pauli’s exclusion principle

B) Heisenberg’s principle

C) Prout’s hypothesis

D) Hund’s Rule

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

76) Which of the sub-shell is circular? ⍟⍟⍟

A) 4f

B) 4s

C) 4p

D) 4d

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Quantum numbers and shapes of orbitals

77) Which pair has 1 electron in its ‘s’ orbital? MDCAT 2020

A) H & He

B) K & Mn

C) Na & Cr

D) Li & Fe

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

78) The frequency of an electromagnetic radiation is 2×10⁶ Hz. What is its wavelength in metres (Velocity of light 3×10⁸ ms⁻¹) ⍟⍟⍟

A) 1.5×10²

B) 6.0×10¹⁴

C) 0.66×10⁻²

D) 1.5×10⁴

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Atomic models and Planck’s quantum theory

79) Who postulated the following equation for energy emission when an electron drops from state n2 to n1? ETEA 2010

A) Bohr

B) Heisenberg

C) Rutherford

D) Einstein

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Category: BOMVirtual.com >> Chemistry >> 02 Atmoic Structure >> Electronic configuration

80) Which pair has 1 electron in its ‘s’ orbital? (ETEA – 2020)

A) K & Mn

B) H & He

C) Li & Fe

D) Na & Cr

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